Wan Shi Tong’s library (WST) is roughly around (-2700, -2800) in the spirit world.
Last time I was there, it was a death trap, and I lost half my health getting in. Also it seems you have to fly to get in, so be an airbender or get a bison I guess.
EDIT: The teleportation glitch has been fixed. You can now enter safely.
Morris and I both found the location of the library independently, but I got there first. Also I lived on my first try. So beat that Morris.
The deadly teleporation entrance is a confirmed issue, will let you know when it’s fixed.
Fixed